Collect.js whereIn() Function

The whereIn() function is used to filter the collection by a given key or value contained within the given array. In JavaScript, the array is first converted to a collection and then the function is applied to the collection.

Syntax:

data.whereIn('key')

Parameters: This function accepts a single parameter as mentioned above and described below:

• Key: This parameter holds the key name that defines the value of that key.

Return value: Returns the collection with a key value that was mentioned.

Below examples illustrate the whereIn() function in collect.js

Example 1: Here in this example, we take a collection and then using the whereIn() method we have returned filtered collection using the key.

// It is used to import collect.js library 
const collection = collect([
  { Book: 'Let US C', price: 2000 },
  { Book: 'Begin Python', price: 1000 },
  { Book: 'Learn the DEV', price: 1500 },
]);

const filtered = collection.whereIn('price', [1000, 1500]);

filtered.all();

Output:

[
  { Book: 'Begin Python', price: 1000 },
  { Book: 'Learn the DEV', price: 1500 }
]

Example 2:

// It is used to import collect.js library 
const collect = require('collect.js'); 

const Input = collect([ 
new Year('1980'), 
new Year('2020'), 
new Year('2025'), 
]); 

const output = Input.whereIn('Year',[2000, 2025]); 

console.log(output.all()); 

Output:

[
  new Year('2025')
]

Reference: https://collect.js.org/api/whereIn.html